19809434 has 16 divisors (see below), whose sum is σ = 30808320. Its totient is φ = 9542880.

The previous prime is 19809409. The next prime is 19809443. The reversal of 19809434 is 43490891.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16982 + ... + 18110.

It is an arithmetic number, because the mean of its divisors is an integer number (1925520).

Almost surely, 2^19809434 is an apocalyptic number.

19809434 is a deficient number, since it is larger than the sum of its proper divisors (10998886).

19809434 is a wasteful number, since it uses less digits than its factorization.

19809434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 19809434 is about 4450.7790329334. The cubic root of 19809434 is about 270.5768826939.

The spelling of 19809434 in words is "nineteen million, eight hundred nine thousand, four hundred thirty-four".